wayne jones asked the Naked Scientists: I'm a long time listener, love the show

I own a small car workshop in Australia and it has 2 roller doors like you would normally see in a garage, and you roll them up by pulling on alarge chain.

Why is it that in winter when its cold its really hard on your hands and it all seems very difficult to pull the doors up, but in summer you can grab the chain and up it comes quite easily. It does not appear to be the door mechanism, so what's the science behind the cold hands.

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